373823827781 has 4 divisors (see below), whose sum is σ = 373961620332. Its totient is φ = 373686035232.

The previous prime is 373823827763. The next prime is 373823827829. The reversal of 373823827781 is 187728328373.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187728328373 = 71 ⋅2644060963.

It can be written as a sum of positive squares in 2 ways, for example, as 307210798756 + 66613029025 = 554266^2 + 258095^2 .

It is a cyclic number.

It is not a de Polignac number, because 373823827781 - 2¹⁴ = 373823811397 is a prime.

It is a super-2 number, since 2×373823827781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 373823827781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (373823827721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68892206 + ... + 68897631.

It is an arithmetic number, because the mean of its divisors is an integer number (93490405083).

Almost surely, 2^373823827781 is an apocalyptic number.

It is an amenable number.

373823827781 is a deficient number, since it is larger than the sum of its proper divisors (137792551).

373823827781 is a wasteful number, since it uses less digits than its factorization.

373823827781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137792550.

The product of its digits is 18966528, while the sum is 59.

The spelling of 373823827781 in words is "three hundred seventy-three billion, eight hundred twenty-three million, eight hundred twenty-seven thousand, seven hundred eighty-one".